http://d.puremagic.com/issues/show_bug.cgi?id=11416

           Summary: Array and slice assignment causes garbage values
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: nobody@puremagic.com
        ReportedBy: daniel350@bigpond.com


--- Comment #0 from daniel350@bigpond.com 2013-11-01 18:56:54 PDT ---
void main() {
    float[3] x = [1,1,1];
    float[] y = [4,4,4,4];

    float[5] w = x[] + y[]; //ok
    writeln(w); // [5, 5, 5, 4, 5.60519e-45]
}

w should be [5, 5, 5, 4, float.init]

Right?
http://dpaste.dzfl.pl/fork/53b6d5b5

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monarchdodra@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |monarchdodra@gmail.com
           Severity|normal                      |enhancement


--- Comment #1 from monarchdodra@gmail.com 2013-11-02 02:55:56 PDT ---
> x[] + y[]; //ok

First: This is already wrong, and should lead to an Error from druntime. Unfortunalty, since druntime is compiled in release mode, you don't trigger it: http://d.puremagic.com/issues/show_bug.cgi?id=8650

Second: "float[5] w = ..." well... ditto. If the array lengths don't match, it's wrong behavior.

Conclusion: The program is wrong, but since druntime is in release, you don't get an error, so you see undefined behavior.

It would have been nice if it had errored out, but didn't. You can always try it re-compiling druntime in non-release: you'll see it error.

Changing this to ER: Should throw an error, or should be able to chose non-release druntime by default.

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--- Comment #2 from daniel350@bigpond.com 2013-11-02 20:03:44 PDT ---
The correctness of the language shouldn't be reliant on the runtime...

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